Parsing Homework 2
Name:
Chapter 13 of your textbook will help you!
1. The following sentence has a coordination ambiguity. Draw two parse trees that attach the ambiguity in two
different locations: He lost the bent nail and hammer.
2. Convert this grammar to Chomsky Normal Form (pg 437). (put your grammar below on the right)
S -> VP NP
VP -> Aux VB NP
NP -> JJ NN NN
NP -> JJ NN
NP -> the NN
3. Section 13.4 describes the CKY parsing algorithm. Figure 13.10 gives the pseudocode. What is the
complexity (big-oh notation) of this algorithm? Use n as the number of words in a sentence. Describe your
answer for partial credit in case you are incorrect.
O(
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